CN112830627B - Domestic sewage treatment method and integrated treatment equipment - Google Patents
Domestic sewage treatment method and integrated treatment equipment Download PDFInfo
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- CN112830627B CN112830627B CN202011629191.XA CN202011629191A CN112830627B CN 112830627 B CN112830627 B CN 112830627B CN 202011629191 A CN202011629191 A CN 202011629191A CN 112830627 B CN112830627 B CN 112830627B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02F3/302—Nitrification and denitrification treatment
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Abstract
The application relates to a domestic sewage treatment method and integrated treatment equipment, and relates to the technical field of sewage treatment, wherein the domestic sewage treatment method comprises ammonia nitrogen removal, precipitation, aeration biological filtration, secondary denitrification, disinfection and discharge, and the ammonia nitrogen removal comprises denitrification and nitrification; the integrated treatment equipment comprises an anoxic tank, an aerobic tank, a nitrifying liquid reflux tank, a dosing tank, a sedimentation tank, a first intermediate tank, a BAF tank, a denitrification tank, a second intermediate tank and a disinfection tank. This application is through nitrifying twice and denitrification treatment, can make the ammonia nitrogen content in the sewage reduce, and then has reduced the probability that the ammonia nitrogen turns into poisonous nitrite, has improved quality of water, has reduced the harm to aquatic thing.
Description
Technical Field
The application relates to the field of sewage treatment, in particular to a domestic sewage treatment method and integrated treatment equipment.
Background
Urban sewage (municipal sewage) refers to domestic sewage of urban residents, drainage of offices, schools, hospitals, commercial service institutions and various public facilities, industrial wastewater and initial rainwater which are allowed to drain into an urban sewage collection system, and the like. The current discharge standard executes the pollutant discharge standard GB 18918-2002 of urban sewage treatment plants, wherein the total phosphorus, the total nitrogen, the ammonia nitrogen, the faecal coliform bacteria number and the like need to meet the required standards except BOD5, COD, SS and pH.
The treatment device of the urban sewage at present comprises a regulating tank, a contact oxidation tank, a sedimentation tank and a disinfection tank, and the treatment steps comprise S1: storing, namely discharging the domestic sewage into a regulating tank for storage; s2: treating organic matters, conveying the sewage in the regulating tank to a contact oxidation tank, and treating organic matter macromolecules in the sewage by a biological oxidation method; s3: precipitating, namely conveying the sewage in the contact oxidation tank to a precipitation tank to precipitate the sludge in the water; s4: disinfecting, namely discharging the sewage in the sedimentation tank into a disinfection tank, and adding a disinfectant into the disinfection tank to disinfect the sewage; s5: and discharging the disinfected water into a city drainage system.
In view of the above-mentioned related technologies, the inventors believe that ammonia nitrogen inhibits the activity and proliferation of microorganisms in the contact oxidation pond when the ammonia nitrogen content in the sewage is high, and reduces the treatment effect, so that the sewage finally discharged into the urban drainage system does not meet the discharge requirements.
Disclosure of Invention
In order to improve the effect of treating sewage and enable the treated sewage to meet the discharge requirement, the application provides a domestic sewage treatment method and integrated treatment equipment.
In a first aspect, the present application provides a domestic sewage treatment method, which adopts the following technical scheme:
a domestic sewage treatment method comprises the following steps:
removing ammonia nitrogen and removing nitrogen elements in domestic sewage;
precipitating sludge in the domestic sewage;
aeration biological filtration, wherein sewage is filtered by a biological filter material;
performing secondary denitrification, and performing denitrification treatment on the sewage again;
sterilizing, namely sterilizing the biological sewage;
discharging, namely discharging the sewage into a municipal drainage system;
the ammonia nitrogen removal comprises denitrification and nitrification;
denitrification, namely performing denitrification treatment on the biochemical sewage;
and (4) nitrification, wherein the domestic sewage is subjected to nitrification treatment.
By adopting the technical scheme, the domestic sewage is subjected to denitrification treatment, nitrate in the sewage is reduced under the anoxic condition, and nitrogen is released; then, carrying out nitration treatment on the domestic sewage to oxidize ammonia nitrogen in the domestic sewage into nitrate; then, precipitating sludge in the domestic sewage to treat biological sludge in the sewage, oxidizing organic matters in the domestic sewage through a biological filter material, removing SS, COD, BOD, AOX and total phosphorus in the sewage through the biological filter material, and simultaneously nitrifying the sewage again; then carrying out secondary denitrification on the sewage to further reduce nitrate in the sewage into nitrogen so as to further reduce the content of ammonia nitrogen in the sewage, then carrying out disinfection and sterilization on the biological sewage, and finally discharging the sewage into a municipal drainage system; because of twice nitrification and denitrification treatments, the content of ammonia nitrogen in the sewage is reduced, the probability of converting the ammonia nitrogen into toxic nitrite is further reduced, the water quality is improved, and the harm to aquatic organisms is reduced.
Optionally, the ammonia nitrogen removal also comprises hydrolytic acidification,
hydrolysis acidification, namely performing hydrolysis acidification on the domestic sewage;
then carrying out denitrification and nitrification.
By adopting the technical scheme, the domestic sewage is hydrolyzed and acidified, so that macromolecular organic matters in the sewage are decomposed into micromolecular organic matters which can be absorbed by denitrifying bacteria, a carbon source is provided for the denitrification reaction, and resources are saved; after denitrification, the content of organic matters in the sewage can be reduced, so that the treatment pressure of subsequent decontamination is reduced, and the treatment efficiency is improved.
Optionally, in the nitrification, aeration treatment is performed on the domestic sewage.
By adopting the technical scheme, the nitrifying bacteria need to consume oxygen during the nitrification reaction, and the reaction rate of the digestion reaction can be increased by aerating the sewage; moreover, the content of dissolved oxygen in the sewage can be increased after the sewage is subjected to aeration treatment, the proliferation of anaerobic bacteria can be inhibited after the sewage is discharged, and the water quality is improved.
Optionally, the precipitation comprises flocculating precipitation and filtering off the supernatant;
flocculating and precipitating, namely putting a flocculating agent into the sewage to enable the sewage to generate flocculating and precipitating;
and filtering out the supernatant, and gradually filtering out the supernatant of the precipitated sewage.
By adopting the technical scheme, the flocculating agent is put into the sewage to flocculate and precipitate the micromolecule organic matters in the sewage, then the supernatant of the sewage is filtered, and the content of the organic matters in the filtered supernatant is reduced; therefore, the treatment pressure of subsequent decontamination can be reduced, and the treatment efficiency can be improved.
Optionally, a nutrient solution adding step is also arranged between the aeration biological filtration and the secondary denitrification;
adding nutrient solution, and adding organic nutrient solution into sewage.
Through adopting above-mentioned technical scheme, when the organic matter content in the sewage is lower, the organic matter in the sewage can't satisfy denitrifying bacteria's needs, after accomplishing aeration biofiltration, adds the organic matter nutrient solution to sewage according to the content of nitrate in the sewage, and then is convenient for denitrifying bacteria to carry out reduction reaction to the nitrate.
In a second aspect, the present application provides an integrated processing apparatus, which adopts the following technical solution:
integration treatment facility, including oxygen deficiency pond, good oxygen pond, sedimentation tank, middle pond of a, BAF pond, denitrification pond and the pond of killing, oxygen deficiency pond and sewage source intercommunication, the oxygen deficiency pond still with good oxygen pond intercommunication, good oxygen pond with the sedimentation tank intercommunication, the sedimentation tank with middle pond intercommunication of a, the sedimentation tank with be provided with the barricade between the middle pond of a, the barricade with the sedimentation tank slides and connects, middle pond of a with BAF pond intercommunication, the BAF pond with denitrification pond intercommunication, the denitrification pond with the pond intercommunication is killed to the digestion, the pond and the urban drainage system intercommunication are killed to the digestion.
By adopting the technical scheme, the domestic sewage automatically flows into the anoxic tank, the sewage is subjected to hydrolysis acidification reaction and denitrification reaction in the anoxic tank, then the sewage automatically flows into the aerobic tank, the sewage is subjected to nitrification reaction in the aerobic tank, then the sewage automatically flows into the sedimentation tank for sedimentation, then the retaining wall descends to enable supernatant in the sedimentation tank to flow into the first intermediate tank, then the sewage in the first intermediate tank is pumped into the BAF tank through the water pump, and the biological filter material in the BAF tank removes SS, COD, BOD, AOX and total phosphorus in the sewage and simultaneously carries out denitrification on the sewage again; then the sewage is pumped into a denitrification tank through a water pump, the denitrification tank performs denitrification on the sewage, so that nitrate in the sewage is reduced into nitrogen, and the content of ammonia nitrogen in the sewage is further reduced; and then the sewage in the denitrification tank is pumped to a disinfection tank by a water pump for disinfection and sterilization, and then the sewage subjected to disinfection and sterilization is discharged to a city drainage system by the water pump.
Optionally, an aeration system is arranged in the aerobic tank, the aeration system comprises an air pump and an aeration pipe, the aeration pipe is laid at the bottom of the aerobic tank, and the aeration pipe is communicated with the air pump.
Through adopting above-mentioned technical scheme, the air pump constantly aerifys in to the aeration pipe, and the air lets in the aerobic tank from the aeration pipe to accelerate digestion reaction's reaction rate has increased the content of dissolved oxygen in the sewage simultaneously, can restrain the hyperplasia of anaerobism after the blowdown water discharges, has improved quality of water.
Optionally, a nitrifying liquid reflux pool is arranged between the aerobic pool and the sedimentation pool, the nitrifying liquid reflux pool is communicated with the aerobic pool and/or the anoxic pool, and the nitrifying liquid reflux pool is also communicated with the sedimentation pool.
By adopting the technical scheme, when sewage automatically flows into the nitrifying liquid reflux pool from the aerobic pool, part of bacteria in the aerobic pool and part of bacteria in the anoxic pool enter the nitrifying liquid reflux pool together with the sewage, then the sewage is subjected to standing precipitation in the nitrifying liquid reflux pool, so that the bacteria are precipitated to the bottom end of the nitrifying liquid reflux pool to form nitrifying liquid, and then the nitrifying liquid is pumped into the aerobic pool and/or the anoxic pool by pumping the nitrifying liquid into the aerobic pool and/or the anoxic pool, so that the content of the bacteria in the aerobic pool and/or the anoxic pool is improved, and the utilization efficiency of the bacteria is improved.
Optionally, a nutrient solution pool is arranged between the BAF pool and the denitrification pool, the nutrient solution pool is communicated with the BAF pool, and the nutrient solution pool is also communicated with the denitrification pool.
Through adopting above-mentioned technical scheme, when the organic matter content in the sewage is lower, the organic matter in the sewage can't satisfy denitrifying bacteria's needs, flows to the nutrient solution pond in from the BAF pond when sewage to add organic matter nutrient solution in the nutrient solution pond according to the content of nitrate in the sewage, and then be convenient for denitrifying bacteria to carry out reduction reaction to the nitrate.
Optionally, a second intermediate tank is arranged between the denitrification tank and the disinfection tank, the denitrification tank is communicated with the second intermediate tank, the second intermediate tank is communicated with the disinfection tank, and the second intermediate tank is further communicated with the BAF tank.
Through adopting above-mentioned technical scheme, the sewage in the denitrification pond discharges and stores after No. two intermediate ponds, just can spill over automatically in the pond of disinfecting when the sewage in No. two intermediate ponds is too much, when having deposited biological silt in the BAF pond, the water pump with No. two sewage pump in the intermediate pond send to the BAF pond and wash the BAF pond, improved the filtration efficiency and the effect in BAF pond.
In summary, the present application includes at least one of the following beneficial technical effects:
1. through the steps of ammonia nitrogen removal, biological aerated filtration and secondary denitrification, sewage is discharged after nitrification and denitrification reactions, and is subjected to multiple nitrification and denitrification treatments, so that the ammonia nitrogen content in the sewage is reduced, the probability of converting the ammonia nitrogen into toxic nitrite is reduced, the water quality is improved, and the harm to aquatic organisms is reduced.
2. Through the arrangement of the hydrolysis acidification step, the domestic sewage is firstly subjected to hydrolysis acidification, so that macromolecular organic matters in the sewage are decomposed into micromolecular organic matters which can be absorbed by denitrifying bacteria, a carbon source is provided for denitrification reaction, and resources are saved; and after the denitrification step, the content of organic matters in the sewage is reduced, so that the treatment pressure of the subsequent decontamination step is reduced, and the treatment efficiency is improved.
3. Through the setting of nitrifying liquid backward flow pond, sewage is stood in nitrifying liquid backward flow pond and is depositd, makes the bacterium deposit to the bottom of nitrifying liquid backward flow pond and forms nitrifying liquid, later through sending the nitrifying liquid to in good oxygen pond and/or the oxygen deficiency pond to improve the content of the bacterium in good oxygen pond and/or the oxygen deficiency pond, improved the utilization efficiency of bacterium.
Drawings
FIG. 1 is a schematic flow diagram of a biological wastewater treatment process according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the overall structure of the integrated treatment device according to the embodiment of the present application;
FIG. 3 is a schematic top view of an integrated processing tool according to an embodiment of the present application.
Description of reference numerals: 100. a box body; 110. an anoxic tank; 120. an aerobic tank; 130. a nitrifying liquid reflux pool; 140. a sedimentation tank; 141. retaining walls; 150. a first intermediate pool; 160. a BAF pool; 170. a denitrification tank; 180. a second intermediate tank; 190. a sterilizing pool; 200. a control room; 210. a medicine adding pool; 220. a nutrient solution pool; 300. an aeration system; 310. an aeration pipe.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses a domestic sewage treatment method and integrated treatment equipment. Referring to fig. 1, the domestic sewage treatment method includes the steps of:
s1: removing ammonia nitrogen and removing nitrogen elements in domestic sewage;
s1: the ammonia nitrogen removal method comprises the following steps of S11: hydrolytic acidification, S12: denitrification and S13: nitration;
s11: hydrolysis acidification, namely performing hydrolysis acidification on the domestic sewage through hydrolysis acidification bacteria to decompose macromolecular organic matters in the domestic sewage into micromolecular organic matters so as to provide a carbon source for next denitrification, consume the dissolved oxygen in the domestic sewage and improve the proliferation rate of the denitrification bacteria;
s12: denitrifying, namely denitrifying the biochemical sewage by denitrifying bacteria to reduce nitrate in the domestic sewage into nitrogen and consume organic matters in the domestic sewage;
s13: nitrification, namely performing nitrification treatment on the domestic sewage by nitrifying bacteria to oxidize ammonia nitrogen in the domestic sewage into nitrate; meanwhile, the domestic sewage is aerated, so that the content of dissolved oxygen in the domestic sewage is increased, and the proliferation rate of nitrobacteria is increased;
s2: precipitating sludge in the domestic sewage;
s2: precipitation includes S21: flocculation precipitation and S22: filtering out the supernatant;
s21: flocculating settling, namely putting a flocculating agent into the sewage to enable organic matters in the domestic sewage to generate flocculating settling, standing the domestic sewage at the same time, and settling partial biological sludge in the domestic sewage to the bottom of a settling pond;
s22: filtering out supernatant, gradually filtering out supernatant of the precipitated sewage, and avoiding the sludge at the bottom of the sedimentation tank from being raised;
s3: aerating biological filtration, discharging supernatant in the sedimentation tank into an aerating biological filtration tank, filtering sewage by using a biological filter material, and further filteringReducing SS and BOD in sewage5COD, AOX and total phosphorus content, and nitrifying the sewage again to oxidize residual ammonia nitrogen in the sewage into nitrate;
s4: adding nutrient solution, namely adding organic nutrient solution into the sewage according to the content of nitrate in the sewage, so as to facilitate the denitrifying bacteria to carry out reduction reaction on the nitrate;
s5: performing secondary denitrification, namely performing denitrification treatment on the sewage again through denitrifying bacteria to reduce nitrate remaining in the sewage into nitrogen;
s6: back flushing, namely performing back flushing on the aeration biological filter tank to clean the aeration biological filter tank when the biological sludge in the aeration biological filter tank is excessive;
s7: killing, namely introducing ClO into the domestic sewage2Sterilizing biological sewage;
s8: discharging, discharging the sewage into a municipal drainage system under detection, if SS and BOD exist in the sewage5And if the contents of COD, AOX, total phosphorus and total nitrogen do not reach the standard, returning the sewage to S3: and the aeration biological filtration step is used for carrying out retreatment.
Referring to fig. 2 and 3, the integrated treatment apparatus includes a tank 100, and the inside of the tank 100 is divided into an anoxic tank 110, an aerobic tank 120, a nitrifying liquid reflux tank 130, a dosing tank 210, a sedimentation tank 140, a first intermediate tank 150, a BAF tank 160, a nutrient solution tank 220, a denitrification tank 170, a second intermediate tank 180, a disinfection tank 190, and a control room 200 by partitions on the inner wall of the tank 100.
Referring to fig. 2 and 3, hydrolytic acidification bacteria and denitrifying bacteria are placed in the anoxic tank 110, and the anoxic tank 110 is communicated with the aerobic tank 120. Nitrifying bacteria are placed in the aerobic tank 120, and the aerobic tank 120 is communicated with the nitrifying liquid reflux tank 130. The nitrifying liquid reflux pool 130 is communicated with the control chamber 200, the nitrifying liquid reflux pool 139 is also communicated with the anoxic pool 110 and/or the aerobic pool 120 through a water pump and a water pipe, the nitrifying liquid reflux pool 130 is communicated with the dosing pool 210, and the dosing pool 210 is communicated with the sedimentation pool 140.
Referring to fig. 2 and 3, an aeration system 300 is disposed in the aerobic tank 120, the aeration system 300 includes an air pump (not shown) and an aeration pipe 310, the aeration pipe 310 is laid on the bottom of the aerobic tank 120, and the aeration pipe 310 is communicated with the air pump.
When treating ammonia nitrogen in domestic sewage, firstly enabling a sewage pump to automatically flow into the anoxic tank 110, enabling hydrolytic acidification bacteria in the anoxic tank 110 to decompose macromolecular organic matters and simultaneously consuming dissolved oxygen in the sewage so as to facilitate the proliferation of denitrifying bacteria; meanwhile, denitrifying bacteria take decomposed macromolecular organic matters as a carbon source to reduce nitrate in the sewage into nitrogen. Then the sewage in the anoxic tank 110 flows into the aerobic tank 120 by itself, and the air pump and the aeration pipe 310 aerate the aerobic tank 120. In the aeration process, the sewage is gradually overturned to enable the sewage to be uniformly mixed, and the content of dissolved oxygen in the sewage is gradually increased so as to facilitate the proliferation of nitrobacteria; meanwhile, nitrifying bacteria oxidize ammonia nitrogen in the sewage into nitrate, and then the sewage automatically flows into the nitrifying liquid reflux pool 130.
Part of the sewage in the nitrifying liquid reflux pool 130 is pumped to the control room 200 for detection, the rest sewage is precipitated in the nitrifying liquid reflux pool 130, so that nitrifying liquid is formed at the bottom of the nitrifying liquid reflux pool 130, and the nitrifying liquid at the bottom of the nitrifying liquid reflux pool 130 is pumped to the anoxic pool 110 and/or the aerobic pool 120 according to the detection result. The residual sewage in the nitrification liquid reflux tank 130 flows into the dosing tank 210 by itself, a flocculating agent is added into the sewage in the dosing tank 210, and then the sewage flows into the sedimentation tank 140 by itself.
Referring to fig. 2 and 3, the sedimentation tank 140 is communicated with the first intermediate tank 150, the first intermediate tank 150 is communicated with the BAF tank 160 through a water pump, the BAF tank 160 is communicated with the nutrient solution tank 220, the nutrient solution tank 220 is communicated with the denitrification tank 170, and the denitrification tank 170 is communicated with the second intermediate tank 180. The second intermediate pool 180 is communicated with a killing pool 190, the second pool is also communicated with the BAF pool 160 through a water pump, and the killing pool 190 is communicated with a city drainage system through a water pump or a valve.
Referring to fig. 3, the sectional area of the bottom of the sedimentation tank 140 is smaller than that of the upper part of the sedimentation tank 140, and a retaining wall 141 is disposed between the sedimentation tank 140 and the first intermediate tank 150, and the retaining wall 141 is slidably connected to the tank 100.
When the sewage flows into the dosing tank 210, an operator puts a flocculating agent into the dosing tank 210, and then the sewage flows into the sedimentation tank 140 automatically. The sewage is stood in the sedimentation tank 140 to flocculate and precipitate organic matters in the sewage, the biological sludge and the organic matters in the sewage are precipitated to the bottom of the sedimentation tank 140 after a period of time, and supernatant is formed at the upper part of the sedimentation tank 140. Then, the retaining wall 141 is lowered such that the upper end of the retaining wall 141 is lower than the level of the supernatant in the sedimentation tank 140, and the supernatant is gradually discharged into the first intermediate tank 150.
The sewage in the first intermediate tank 150 is pumped into the BAF tank 160 through the water pump, and the biological filter material in the BAF tank 160 removes SS, COD, BOD, AOX and total phosphorus in the sewage, and simultaneously carries out nitrification again on the sewage. Because the sewage is aerated for one time in the aerobic tank 120, the content of dissolved oxygen in the sewage is higher, the nitrobacteria in the BAF tank 160 can be quickly propagated, and the nitrification efficiency is improved; and the sedimentation tank 140 performs preliminary sedimentation on the sewage, reduces the content of SS and organic matters in the sewage, reduces the filtering pressure of the BAF tank 160, and improves the filtering efficiency of the BAF tank 160.
Then the sewage flows into the nutrient solution tank 220 automatically, an operator adds organic nutrient solution into the sewage according to the content of nitrate in the sewage, then the sewage flows into the denitrification tank 170 automatically, the denitrification tank 170 performs denitrification on the sewage, and then the nitrate in the sewage is reduced into nitrogen, so that the content of ammonia nitrogen in the sewage is further reduced. Then the sewage flows into the second intermediate pool 180 for storage, and when the storage amount of the sewage in the second intermediate pool 180 is large, the sewage automatically overflows the second intermediate pool 180 and flows into the disinfection pool 190.
When the BAF pond 160 treats sewage, SS and microorganisms in the sewage form biosludge and settle on the bottom of the BAF pond 160. When the bio-sludge in the BAF tank 160 is excessive, the bio-sludge covers the bio-bed in the BAF tank 160, reducing the probability of bacteria on the bio-bed contacting the sewage. At this time, the sewage tank BAF pool 160 in the second intermediate pool 180 is pumped to clean the BAF pool 160, so that the storage amount of the biological sludge in the BAF pool 160 is reduced, and the contact rate of the biological bed and the sewage is improved.
After the sewage is pumped into the disinfection tank 190, the operatorIntroducing ClO into the sterilizing tank 1902And (5) sterilizing and disinfecting the sewage in the sterilizing tank 190 by using the gas. And finally, pumping the sewage into the urban drainage system by a water pump, or opening a valve in the killing tank 190 to automatically discharge the sewage in the killing tank 190 into the urban drainage system.
The implementation principle of the domestic sewage treatment method and the integrated treatment equipment in the embodiment of the application is as follows:
macromolecular organic matters in the sewage are hydrolyzed in the anoxic tank 110 to provide a carbon source for denitrifying bacteria, then the denitrifying bacteria reduce nitrate into nitrogen, then the sewage is subjected to nitration reaction in the aerobic tank 120, and simultaneously the sewage is aerated to improve the content of dissolved oxygen in the sewage; then the sewage flows into the nitrifying liquid reflux pool 130 automatically. Part of the sewage in the nitrifying liquid reflux pool 130 is pumped to the control room 200 for detection, the rest sewage is precipitated in the nitrifying liquid reflux pool 130, so that nitrifying liquid is formed at the bottom of the nitrifying liquid reflux pool 130, and the nitrifying liquid at the bottom of the nitrifying liquid reflux pool 130 is pumped to the anoxic pool 110 and/or the aerobic pool 120 according to the detection result. The residual sewage in the nitrifying liquid reflux pool 130 automatically flows into the dosing pool 210, a flocculating agent is added into the sewage in the dosing pool 210, then the sewage automatically flows into the sedimentation pool 140 for standing, and organic matters are precipitated in the sedimentation pool 140 under the action of the flocculating agent; after precipitation, the sewage is discharged into a BAF pool 160 for filtration to remove SS, COD, BOD, AOX and total phosphorus in the sewage, then the sewage flows into a nutrient solution pool 220 automatically, an operator adds an organic nutrient solution into the sewage according to the content of nitrate in the sewage, then the sewage flows into a denitrification pool 170 automatically for denitrification, and further the residual ammonia nitrogen in the sewage is removed; and finally, the sewage enters a disinfection tank 190 for disinfection and discharge to a municipal drainage system.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (1)
1. The integrated treatment equipment comprises a box body, wherein the inner wall of the box body is provided with a through holeThe interior of the box body is divided into an anoxic tank, an aerobic tank, a nitrifying liquid reflux tank, a dosing tank, a sedimentation tank, a first intermediate tank, a BAF tank, a nutrient solution tank, a denitrification tank, a second intermediate tank, a disinfection tank and a control room by a partition plate; hydrolytic acidification bacteria and denitrifying bacteria are placed in the anoxic tank, and the anoxic tank is communicated with the aerobic tank; nitrifying bacteria are placed in the aerobic tank, and the aerobic tank is communicated with the nitrifying liquid reflux tank; the nitrifying liquid reflux pool is communicated with the control chamber, the nitrifying liquid reflux pool is also communicated with the anoxic pool and/or the aerobic pool through a water pump and a water pipe, the nitrifying liquid reflux pool is communicated with the dosing pool, and the dosing pool is communicated with the sedimentation pool; an aeration system is arranged in the aerobic tank, the aeration system comprises an air pump and an aeration pipe, the aeration pipe is laid at the bottom of the aerobic tank, and the aeration pipe is communicated with the air pump; when treating ammonia nitrogen in domestic sewage, firstly enabling a sewage pump to automatically flow into an anoxic tank, enabling hydrolytic acidification bacteria in the anoxic tank to decompose macromolecular organic matters and simultaneously consuming dissolved oxygen in the sewage so as to facilitate the proliferation of denitrifying bacteria; meanwhile, denitrifying bacteria take decomposed macromolecular organic matters as a carbon source to reduce nitrate in the sewage into nitrogen; then the sewage in the anoxic tank automatically flows into the aerobic tank, and simultaneously the air pump and the aeration pipe aerate the aerobic tank; in the aeration process, the sewage is gradually overturned to enable the sewage to be uniformly mixed, and the content of dissolved oxygen in the sewage is gradually increased so as to facilitate the proliferation of nitrobacteria; meanwhile, nitrifying bacteria oxidize ammonia nitrogen in the sewage into nitrate, and then the sewage automatically flows into a nitrifying liquid reflux pool; pumping part of sewage in the nitrifying liquid reflux pool to a control room for detection, precipitating the rest sewage in the nitrifying liquid reflux pool to form nitrifying liquid at the bottom of the nitrifying liquid reflux pool, and pumping the nitrifying liquid at the bottom of the nitrifying liquid reflux pool to an anoxic pool and/or an aerobic pool according to a detection result; the residual sewage in the nitrifying liquid reflux pool flows into a dosing pool automatically, a flocculating agent is added into the sewage in the dosing pool, and then the sewage flows into a sedimentation pool automatically; the sedimentation tank is communicated with the first intermediate tank, the first intermediate tank is communicated with the BAF tank through a water pump, the BAF tank is communicated with the nutrient solution tank, the nutrient solution tank is communicated with the denitrification tank, and the denitrification tank is communicated with the second intermediate tank; the second intermediate pool is communicated with the disinfection pool, and the second pool is also communicated with the BAF through a water pumpThe water sterilizing pool is communicated with a city drainage system through a water pump or a valve; the sectional area of the bottom of the sedimentation tank is smaller than that of the upper part of the sedimentation tank, a retaining wall is arranged between the sedimentation tank and the first intermediate tank, and the retaining wall is connected with the box body in a sliding manner; when sewage flows into the dosing tank, an operator puts a flocculating agent into the dosing tank, and then the sewage automatically flows into the sedimentation tank; standing the sewage in a sedimentation tank to flocculate and precipitate organic matters in the sewage, wherein the biological sludge and the organic matters in the sewage can be precipitated to the bottom of the sedimentation tank after a period of time, and supernatant is formed at the upper part of the sedimentation tank; then, the retaining wall is lowered, the upper end of the retaining wall is lower than the liquid level of the supernatant in the sedimentation tank, and the supernatant is gradually discharged into the first intermediate tank; pumping the sewage in the first intermediate tank into a BAF tank through a water pump, removing SS, COD, BOD, AOX and total phosphorus in the sewage by using a biological filter material in the BAF tank, and simultaneously carrying out nitrification again on the sewage; then the sewage flows into a nutrient solution tank automatically, an operator adds an organic nutrient solution into the sewage according to the content of nitrate in the sewage, then the sewage flows into a denitrification tank automatically, the denitrification tank performs denitrification on the sewage, the nitrate in the sewage is reduced into nitrogen, and the content of ammonia nitrogen in the sewage is further reduced; then the sewage automatically flows into a second intermediate tank for storage, and when the storage amount of the sewage in the second intermediate tank is large, the sewage automatically overflows the second intermediate tank and then flows into a disinfection tank; when the BAF tank is used for treating sewage, SS and microorganisms in the sewage can form biological sludge and precipitate at the bottom of the BAF tank; when the biological sludge in the BAF pond is excessive, the biological sludge can cover a biological bed in the BAF pond, so that the probability of the bacteria on the biological bed contacting sewage is reduced; pumping the sewage tank BAF pool in the second intermediate pool, and further cleaning the BAF pool; when the sewage is pumped into the disinfection tank, an operator introduces ClO into the disinfection tank2Gas for sterilizing and disinfecting the sewage in the sterilizing tank; finally, the sewage is pumped into the urban drainage system by a water pump, or a valve in the sterilizing tank is opened to automatically discharge the sewage in the sterilizing tank into the urban drainage system; when in use, the method specifically comprises the following steps:
s1: removing ammonia nitrogen and removing nitrogen elements in domestic sewage; the ammonia nitrogen removal method comprises the following steps of S11: hydrolytic acidification, S12: denitrification and S13: nitration;
s11: hydrolysis acidification, namely performing hydrolysis acidification on the domestic sewage through hydrolysis acidification bacteria to decompose macromolecular organic matters in the domestic sewage into micromolecular organic matters so as to provide a carbon source for next denitrification, consume the dissolved oxygen in the domestic sewage and improve the proliferation rate of the denitrification bacteria;
s12: denitrifying, namely denitrifying the biochemical sewage by denitrifying bacteria to reduce nitrate in the domestic sewage into nitrogen and consume organic matters in the domestic sewage;
s13: nitrification, namely performing nitrification treatment on the domestic sewage by nitrifying bacteria to oxidize ammonia nitrogen in the domestic sewage into nitrate; meanwhile, the domestic sewage is aerated, so that the content of dissolved oxygen in the domestic sewage is increased, and the proliferation rate of nitrobacteria is increased;
s2: precipitating sludge in the domestic sewage; precipitation includes S21: flocculation precipitation and S22: filtering out the supernatant;
s21: flocculating settling, namely putting a flocculating agent into the sewage to enable organic matters in the domestic sewage to generate flocculating settling, standing the domestic sewage at the same time, and settling partial biological sludge in the domestic sewage to the bottom of a settling pond;
s22: filtering out supernatant, gradually filtering out supernatant of the precipitated sewage, and avoiding the sludge at the bottom of the sedimentation tank from being raised;
s3: aerating biological filtration, discharging the supernatant in the sedimentation tank into an aerating biological filtration tank, filtering the sewage by biological filter materials, and further reducing SS and BOD in the sewage5COD, AOX and total phosphorus content, and nitrifying the sewage again to oxidize residual ammonia nitrogen in the sewage into nitrate;
s4: adding nutrient solution, namely adding organic nutrient solution into the sewage according to the content of nitrate in the sewage, so as to facilitate the denitrifying bacteria to carry out reduction reaction on the nitrate;
s5: performing secondary denitrification, namely performing denitrification treatment on the sewage again through denitrifying bacteria to reduce nitrate remaining in the sewage into nitrogen;
s6: back flushing, namely performing back flushing on the aeration biological filter tank to clean the aeration biological filter tank when the biological sludge in the aeration biological filter tank is excessive;
s7: killing, namely introducing ClO into the domestic sewage2Sterilizing biological sewage;
s8: discharging, discharging the sewage into a municipal drainage system under detection, if SS and BOD exist in the sewage5And if the contents of COD, AOX, total phosphorus and total nitrogen do not reach the standard, returning the sewage to S3: and the aeration biological filtration step is used for carrying out retreatment.
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